Search Publications
GASKAP-HI pilot survey science I: ASKAP zoom observations of HI emission in the Small Magellanic Cloud
van Loon, J. Th.; Lee, M. -Y.; Joncas, G. +53 more
We present the most sensitive and detailed view of the neutral hydrogen ( ${H\small I}$ ) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilo…
The non-thermal emission from the colliding-wind binary Apep
del Palacio, S.; De Becker, M.; Romero, G. E. +2 more
Therecently discovered massive binary system Apep is the most powerful synchrotron emitter among the known Galactic colliding-wind binaries. This makes this particular system of great interest to investigate stellar winds and the non-thermal processes associated with their shocks. This source was detected at various radio bands, and in addition th…
Discovery of the most luminous quasar of the last 9 Gyr
Fan, Xiaohui; Wolf, Christian; Lai, Samuel +8 more
We report the discovery of a bright ( g = 14.5 mag (AB), K = 11.9 mag (Vega)) quasar at redshift z=0.83 — the optically brightest (unbeamed) quasar at z>0.4. SMSS J114447.77-430859.3, at a Galactic latitude of b=+18.1°, was identified by its optical colours from the SkyMapper Southern Survey (SMSS) during a search for symbiotic binary stars. Op…
First photometric and orbital period investigations of four W UMa-type eclipse binaries
Meng, Zi-Bin; Wang, Hong-Wei; Yu, Yun-Xia +2 more
We presented the first photometric and orbital period investigations for four W Ursae Majoris-type binaries: V473 And, V805 And, LQ Com, and EG CVn. The photometric solutions suggested that V805 And and LQ Com are two total-eclipse contact binaries, while V473 And and EG CVn are partial-eclipse ones. V473 And and LQ Com belong to the A-subtype con…
HST WFC3/Grism observations of the candidate ultra-high-redshift radio galaxy GLEAM J0917-0012
Seymour, N.; Drouart, G.; Vernet, J. D. R. +11 more
We present Hubble Space Telescope Wide Field Camera 3 photometric and grism observations of the candidate ultra-high-redshift ( $z>7$ ) radio galaxy, GLEAM J0917-0012. This radio source was selected due to the curvature in its 70-230 MHz, low-frequency Murchison Widefield Array radio spectrum and its faintness in K-band. Follow-up spectroscopic…
A search for annihilating dark matter in 47 Tucanae and Omega Centauri
Staveley-Smith, Lister; Bekki, Kenji; Westmeier, Tobias +1 more
A plausible formation scenario for the Galactic globular clusters 47 Tucanae (47 Tuc) and Omega Centauri $(ω$ Cen) is that they are tidally stripped remnants of dwarf galaxies, in which case they are likely to have retained a fraction of their dark matter cores. In this study, we have used the ultra-wide band receiver on the Parkes telescope (Murr…
Infrared study of the star-forming region associated with the UC HII regions G45.07+0.13 and G45.12+0.13
Azatyan, N.; Nikoghosyan, E.; Harutyunian, H. +2 more
Ultra-compact H II (UC HII) regions are an important phase in the formation and early evolution of massive stars and a key component of the interstellar medium (ISM). The main objectives of this work are to study the young stellar population associated with the G45.07+0.13 and G45.12+0.13 UC HII regions, as well as the ISM in which they are embedd…
Evidence of distant spiral arms in the Galactic disk quadrant IV from VVV red clump giants
Minniti, D.; Saito, R. K.; Alonso-García, J. +4 more
The discovery of new clear windows in the Galactic plane using the VVV near-IR extinction maps allows the study of the structure of the Milky Way (MW) disk. The ultimate goal of this work is to map the spiral arms in the far side of the MW, which is a relatively unexplored region of our Galaxy, using red clump (RC) giants as distance indicators. W…